[ci] Run on push or PR (#1974)

## Description

CI will now run whenever a branch is pushed or a PR is opened. Fixes
2027 behaviour and allows running CI on forks

## Meta

Merge checklist:
- [x] Pull Request title is [short, imperative
summary](https://cbea.ms/git-commit/) of proposed changes
- [x] The description documents the _what_ and _why_
- [ ] If this PR changes behavior or adds a feature, user documentation
is updated
- [ ] If this PR touches photon-serde, all messages have been
regenerated and hashes have not changed unexpectedly
- [ ] If this PR touches configuration, this is backwards compatible
with settings back to v2024.3.1
- [ ] If this PR touches pipeline settings or anything related to data
exchange, the frontend typing is updated
- [ ] If this PR addresses a bug, a regression test for it is added

Signed-off-by: Jade Turner <spacey-sooty@proton.me>

.github/workflows/python.yml

@@ -5,12 +5,7 @@ permissions:
 
 on:
   push:
-    branches: [ main ]
-    tags:
-      - 'v*'
   pull_request:
-    branches: [ main ]
-  merge_group:
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}